Commands by matthewdavis

Commands by matthewdavis (3)

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Convert .flv to .avi

I'm not well enough versed in the differences between ffmpeg & mencoder to know which one is better.
This is sample output - yours may be different.
0

ffmpeg -i file.flv file.avi

matthewdavis · 2010-09-02 18:18:38 2
Change user, assume environment, stay in current dir

I've used this a number of times troubleshooting user permissions. Instead of just 'su - user' you can throw another hyphen and stay in the original directory. Show Sample Output
This is sample output - yours may be different.
```
[root@localhost local]# pwd
/usr/local
[root@localhost local]# su -- user
[user@localhost local]$ pwd
/usr/local
[user@localhost local]$
```
13

su -- user

matthewdavis · 2009-09-28 04:23:43 3
Find files that were modified by a given command

This has helped me numerous times trying to find either log files or tmp files that get created after execution of a command. And really eye opening as to how active a given process really is. Play around with -anewer, -cnewer & -newerXY Show Sample Output
This is sample output - yours may be different.
```
[root@localhost ~]# touch /tmp/service
[root@localhost ~]# service cups restart
Stopping cups:                                             [  OK  ]
Starting cups:                                             [  OK  ]
[root@localhost ~]# find /var -newer /tmp/service
/var/cache/cups/job.cache
/var/lock/subsys
/var/lock/subsys/cups
/var/log/audit/audit.log
/var/run
/var/run/cupsd.pid
/var/run/cups
/var/run/cups/cups.sock
/var/run/cups/certs
/var/run/cups/certs/0
[root@localhost ~]#
```
22

touch /tmp/file ; $EXECUTECOMMAND ; find /path -newer /tmp/file

matthewdavis · 2009-08-31 18:47:19 8

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list files recursively by size

Detect illegal access to kernel space, potentially useful for Meltdown detection

Based on capsule8 agent examples, not rigorously tested

Check if *hardware* is 32bit or 64bit

This command tell you if your hardware is 32 or 64 bits even if you install a 32bits OS on a 64 bits hardware. If your distro don't support the -q switch, try doing : $ grep &>/dev/null '\' /proc/cpuinfo && echo 64 bits || echo 32 bits

check the status of 'dd' in progress (OS X)

Your platform may not have pv by default. If you are using Homebew on OSX, simply 'brew install pv'.

ls -qaltr # list directory in chronological order, most recent files at end of list

I find it very handy to be able to quickly see the most recently modified/created files in a directory. Note that the "q" option will reveal any files with non-printable characters in their filename.

translates acronyms for you

very handy if you are in irc and absolutely don't know what these guys are talking about. this is a netbsd command, if you are lucky it exists in your distro's package database.

Terminal redirection

can display the commands and their output to another user who is connected to another terminal, by example pts/3

List of commands you use most often

Find the package that installed a command

Find wich ports you probably want to open in your firewall on a fresh installed machine

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